Energy Distribution Analysis Of High Power Laser Beam From Spots On Paper

J. Merlin; C. Oliveira; J. Dietz

doi:10.1117/12.968906

16 January 1988 Energy Distribution Analysis Of High Power Laser Beam From Spots On Paper

J. Merlin, C. Oliveira, J. Dietz

Proceedings Volume 0952, Laser Technologies in Industry; (1988) https://doi.org/10.1117/12.968906
Event: Laser Technologies in Industry, 1988, Porto, Portugal

Abstract

When a laser beam radiates an isolant material like paper during a small period of time (<0,is), toe induce,, degradation can be considered proportional to the incident energy density ("fluence"). This pnenomenon can be used to vizualise the laser beam profile before or after crossing an optic device. The beam mode , its possible fluctuations, and toe interference phenchluna introduced by optic elements can be easily evidenciated (it is only necessary that fluence be inciudee hetween 1 and 20 J/cm²). In a quantitative view-point the observed degradations (level of coloration, burn) can be standardized in fluence. So for a given interaction time it is possible to define the local density power ("irradiance" in W/cm²), necessary to induce the observed degradation. Consequently it is possible to reconstitute the energy repartition profile of the beam; this was achieved for the case of c.w. CO² laser Oi 4 kW for different powers. This procedure requires a good quality paper (type "printer inkjet paper") and the accuracy can be ameliorated utilizing a "printer thermal paper". An image aoijuis software allowing toe deduction of the intrinsic characteristics of the beau is being studied.

Citation Download Citation

J. Merlin, C. Oliveira, and J. Dietz "Energy Distribution Analysis Of High Power Laser Beam From Spots On Paper", Proc. SPIE 0952, Laser Technologies in Industry, (16 January 1988); https://doi.org/10.1117/12.968906

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